I devised a quick solution to ensure whether the problem was bigger than we thought or not. Could you please test it with 2.17.3-resetUiLocation version?
There is a menu button now to reset the location to the center of the SketchUp window. Please make sure the Speckle is initialized before resetting the window location.
PS: I couldn’t reproduce the issue as you explained. So still not sure this will fix it. 
Super! Is working!